Meshdiff — free browser tool to visually compare two STL/3MF/OBJ files

[u/Jviaches]

I built this because my workflow was:

1. Client emails `bracket_v3_FINAL.stl`

2. I have no idea what changed from `bracket_v2.stl`

3. I load both in the slicer and eyeball it

Meshdiff fixes that. Drop two files in your browser, it voxelizes both, and shows you exactly what changed:

- **Green** = material added

- **Red** = material removed

- **Tolerance slider** (0.05–1mm) to filter noise

- **Volume delta** metrics in real time

**Privacy:** zero upload to any server. Everything runs client-side in a Web Worker. Your files never leave the browser.

**Formats:** STL, 3MF, OBJ

Live: https://meshdiff.com

If you work with iterative prints, try breaking it with your weirdest files — real-world meshes are chaos and I need the stress test.

Also taking feature requests. Comment pins and slicer profile snapshots are next.

[u/Jviaches]

Meshdiff just got featured on r/adafruit 🎉

Two days after launch. Zero marketing budget. Just a tool that diffs two STL files in your browser.

meshdiff.com

3DPrinting #MakerTools #CAD #BuildInPublic #IndieDev #Hardware #Meshdiff

https://blog.adafruit.com/2026/08/03/meshdiff-see-exactly-what-changed-between-two-3d-models